A method for preventing roadway floor heave and wall slippage in gob-side entry retention

Abstract

The invention discloses a method for preventing roadway floor drum and wall slippage in gob-side retaining roadway. Construct a protective unit every 2 meters until the entire gob-side entry is completed. The present invention adopts technical means such as adopting the wave-shaped anti-arch steel pipe of the bottom plate, coordinating the grouting steel pipe arranged obliquely, and reinforcing the steel pipe at the foot of the roadway, and fixing the three together, so as to change the stress state of the surrounding rock of the roadway and avoid The floor drum of the roadway is caused by the pressure film effect on the floor of the two sides of the roadway; and the vertical pressure on the two sides of the roadway is converted into a downward extrusion force on the roadway floor, which further restricts the bottom drum of the roadway; at the same time, by improving the bottom of the roadway The force of the surrounding rock at the foot should be considered to avoid wall slippage caused by damage to the weak parts of the roadway. The invention is safe and reliable, has strong adaptability and is suitable for popularization and application of gob-side entry retention.

Description

technical field [0001] The invention relates to a method for controlling the stability of a roadway, in particular to a method for preventing the bottom drum and wall of a roadway in a gob-side retaining roadway from slipping, and belongs to the technical field of mine support. Background technique [0002] Mining without coal pillars is beneficial to improve the recovery rate of coal, and can also eliminate or reduce the disasters caused by coal pillars, so it has been widely used in recent years. With the acceleration of the depletion of coal resources, coal pillarless mining is getting more and more attention from the industry. Gobside entry retention is an important development direction of pillarless mining. Because the gob-side retaining has a coal pillar that can be canceled to maintain the roadway, it can improve the recovery rate of coal resources, make full use of the rational development of coal resources, prolong the service life of the mine, and be conducive to...

AI Technical Summary

Problems solved by technology

[0007] Whether it is the reinforcement method or the pressure relief method, there are major deficiencies and defects. Although these methods can play a certain role in controlling the gob-side entry floor in a relatively low-stress environment, their control capabilities are limited

However, the undercover method commonly used in engineering sites is neither economical nor fundamentally solves the problem of floor drum control in gob-side entry retention

At present, there are not many methods to limit the strong sliding of the wall to the roadway. Only the measures to limit the displacement between the wall and the roof are provided by setting multiple shear anchors connecting the roof and the floor. However, the bending and shear resistance of the anchors is poor. The control effect is not ideal, and it is difficult to effectively control the wall slippage

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